<template>
  <div class="xtx-goods-page">
    <!-- 这里如果不加v-if  sku组件可能会报错 -->
    <!-- 这里使用v-if
    问题:
      组件首次渲染的时候, 用到的数据是一个空对象{},{}.brand是undefined
    机制:
      组件响应式数据驱动视图, 两次渲染, 后端数据返回之前先使用默认值渲染一次,后端数据返回之后,再使用完整的数据再渲染一次
      解决:
      v-if手动控制渲染时机, 放弃了第一次渲染, 只有数据完全存在的时候才会去进行首次渲染
     -->
    <div class="container" v-if="goodData && goodData.brand">
      <!-- 商品信息 -->
      <div class="goods-info">
        <div class="media">
          <!-- 图片预览区 -->
          <XtxImageView :image-list="goodData.mainPictures"></XtxImageView>
          <!-- 统计数量 -->
          <ul class="goods-sales">
            <li>
              <p>销量人气</p>
              <p>{{ goodData.salesCount }}+</p>
              <p><i class="iconfont icon-task-filling"></i>销量人气</p>
            </li>
            <li>
              <p>商品评价</p>
              <p>{{ goodData.commentCount }}+</p>
              <p><i class="iconfont icon-comment-filling"></i>查看评价</p>
            </li>
            <li>
              <p>收藏人气</p>
              <p>{{ goodData.collectCount }}+</p>
              <p><i class="iconfont icon-favorite-filling"></i>收藏商品</p>
            </li>
            <li>
              <p>品牌信息</p>
              <!--
           goodData.brand 是 undefined
          -->
              <!-- 解决方案:
          1.  ?.可选链 goodData.brand?.name
          2.  在父组件v-if判断和&& v-if="goodData && goodData.brand"
         -->
              <p>{{ goodData.brand.name }}</p>
              <p><i class="iconfont icon-dynamic-filling"></i>品牌主页</p>
            </li>
          </ul>
        </div>
        <div class="spec">
          <!-- 商品信息区 -->
          <p class="g-name">{{ goodData.name }}</p>
          <p class="g-desc">{{ goodData.desc }}</p>
          <p class="g-price">
            <span>{{ goodData.price }}</span>
            <span>{{ goodData.oldPrice }}</span>
          </p>
          <div class="g-service">
            <dl>
              <dt>促销</dt>
              <dd>12月好物放送，App领券购买直降120元</dd>
            </dl>
            <dl>
              <dt>服务</dt>
              <dd>
                <span>无忧退货</span>
                <span>快速退款</span>
                <span>免费包邮</span>
                <a href="javascript:;">了解详情</a>
              </dd>
            </dl>
          </div>
          <!-- sku组件 -->
          <XtxGoodSku :goods="goodData" @change="skuChange"></XtxGoodSku>
          <!-- 数据组件 -->
          <!-- 知识难点:v-model -->
          <XtxNumbox :min="1" :max="10" v-model="modelValue"></XtxNumbox>
          <!-- 按钮组件 -->
          <XtxButton type="primary" style="margin-top: 20px" @click="insertCart">加入购物车</XtxButton>
        </div>
      </div>
      <div class="goods-footer">
        <div class="goods-article">
          <!-- 商品详情 -->
          <goodDetails :goods="goodData"></goodDetails>
        </div>
        <!-- 24热榜+专题推荐 -->
        <div class="goods-aside">
          <!-- 24 -->
          <goodHot :type="1"></goodHot>
          <!-- 周 -->
          <goodHot :type="2"></goodHot>
          <!-- 总 -->
          <goodHot :type="3"></goodHot>
        </div>
      </div>
    </div>
  </div>
</template>

<script>
import { findGoods } from '@/api/good.js'
import { ref } from 'vue'
import { useRoute, useRouter } from 'vue-router'
import { useStore } from 'vuex'
import goodDetails from './components/good-details.vue'
import goodHot from './components/good-hot.vue'
import { Message } from '@/components/Message/index.js'
export default {
  components: {
    goodDetails,
    goodHot
  },
  setup () {
    const store = useStore()
    const goodData = ref({})
    const router = useRouter()
    const route = useRoute()
    // v-model加入商品的数量
    const modelValue = ref(1)
    async function loadData () {
      const res = await findGoods(route.params.id)
      goodData.value = res.result
    }
    // sku组件拿到的值
    let skuIdObj = {}
    function skuChange (skuValue) {
      console.log(skuValue)
      if (!skuValue) {
        return Message({ type: 'error', text: '请先选择商品' })
      }
      skuIdObj = skuValue
    }
    loadData()
    // 加入购物车功能
    function insertCart () {
      // 是否有token
      const token = store.state.user.profile.token
      if (!token) {
        // 跳转登录页+提示
        router.push({ path: '/login' })
        // return 的是一个函数调用
        return Message({ type: 'error', text: '请先登录' })
      }

      if (!skuIdObj.skuId) {
        return Message({ type: 'error', text: '请先选择' })
      } else {
        // 触发加入购物车请求
        store.dispatch('cart/asynccartList', {
          skuId: skuIdObj.skuId,
          count: modelValue.value
        })
      }
    }
    return { goodData, skuChange, modelValue, insertCart }
  }
}
</script>
<style scoped lang="less">
.goods-info {
  min-height: 600px;
  background: #fff;
  display: flex;
  .media {
    width: 580px;
    height: 600px;
    padding: 30px 50px;
  }
  .spec {
    flex: 1;
    padding: 30px 30px 30px 0;
  }
}
.goods-footer {
  display: flex;
  margin-top: 20px;
  .goods-article {
    width: 940px;
    margin-right: 20px;
  }
  .goods-aside {
    width: 280px;
    min-height: 1000px;
  }
}
.goods-tabs {
  min-height: 600px;
  background: #fff;
}
.goods-warn {
  min-height: 600px;
  background: #fff;
  margin-top: 20px;
}

.number-box {
  display: flex;
  align-items: center;
  .label {
    width: 60px;
    color: #999;
    padding-left: 10px;
  }
}
.g-name {
  font-size: 22px;
}
.g-desc {
  color: #999;
  margin-top: 10px;
}
.g-price {
  margin-top: 10px;
  span {
    &::before {
      content: '¥';
      font-size: 14px;
    }
    &:first-child {
      color: @priceColor;
      margin-right: 10px;
      font-size: 22px;
    }
    &:last-child {
      color: #999;
      text-decoration: line-through;
      font-size: 16px;
    }
  }
}
.g-service {
  background: #f5f5f5;
  width: 500px;
  padding: 20px 10px 0 10px;
  margin-top: 10px;
  dl {
    padding-bottom: 20px;
    display: flex;
    align-items: center;
    dt {
      width: 50px;
      color: #999;
    }
    dd {
      color: #666;
      &:last-child {
        span {
          margin-right: 10px;
          &::before {
            content: '•';
            color: @xtxColor;
            margin-right: 2px;
          }
        }
        a {
          color: @xtxColor;
        }
      }
    }
  }
}
.goods-sales {
  display: flex;
  width: 400px;
  align-items: center;
  text-align: center;
  height: 140px;
  li {
    flex: 1;
    position: relative;
    ~ li::after {
      position: absolute;
      top: 10px;
      left: 0;
      height: 60px;
      border-left: 1px solid #e4e4e4;
      content: '';
    }
    p {
      &:first-child {
        color: #999;
      }
      &:nth-child(2) {
        color: @priceColor;
        margin-top: 10px;
      }
      &:last-child {
        color: #666;
        margin-top: 10px;
        i {
          color: @xtxColor;
          font-size: 14px;
          margin-right: 2px;
        }
        &:hover {
          color: @xtxColor;
          cursor: pointer;
        }
      }
    }
  }
}
</style>
